Malicious PDF — malware analysis report

Static analysis result for SHA-256 502e05b74b8afb29…

MALICIOUS

PDF

77.1 KB Created: 2021-07-08 05:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf10921f518774361f08be6a8a0109ce SHA-1: 1a45be928d58a693ad549d1fbc766591380154ff SHA-256: 502e05b74b8afb298d2fa945ff694c4d308d24c65a6a453804c8fd6e4b62ca10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's used to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to distribute phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=apple+during+early+pregnancy
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/897d59c2fb5707cf6f58608c96ff5c89/mewowu.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/773c325177cfa84cead704dbc593ffde/bamubixowivanepokox.pdf
    • http://ei-windykacja.pl/upload/file/purarit.pdf
    • https://callalilyvn.com/upload/files/62832157560.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/gejagokolakazomararu.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcee775339---89634766567.pdf
    • http://beastyenergy.com/userfiles/file/rotepolubogefenozomawun.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b222c03cf23---89353183084.pdf
    • http://koyomisushi.com/uploads/files/18780661274.pdf
    • http://www.vegagastro.pl/upload/file/93586795057.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24963426d---mawujato.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/db15e9aa791b1077e610f9430af78a4a/83538985153.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ber44t151c9ii0m7dgmncdm63o/mejemuxa.pdf
    • https://mygo.com/ckfinder/userfiles/files/52386598857.pdf
    • http://project-lovcen.me/userfiles/file/gubapoxudalikejakaxu.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/deb4d392ab40f8196d99165bc5a69e2d/70797617579.pdf
    • http://terezmisszio.eu/files/file/piraxemesibifivel.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f8375f62---repikadu.pdf
    • https://africanresearchcenter.com/userfiles/file/zadaze.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e794c654f124129bf8bd6aed8e0617db/lilidirufodifu.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160986f89a7d77---50518103485.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wugupawetenofu.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/50122d86f1a738c9efb1c23f01e6a01f/goxexixuxakoremisigewe.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7e58a00dbf67c3672980aa5d720ac0ad/1910707290.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/81l0v99eg22tjm0vge8um4e23b/sawomuzusekesasube.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd2f.bin
6f1cc8bdd51b1e052a54d3864b22f8bca23aa63b5347cfcb88361c2731f1f003
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 10496 bytes
font_01_sfnt_off0000e4f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 16792 bytes
font_02_sfnt_off0000fd03.bin
ffad9c336b3c17c8135116a116ebfa78fe3079b4b5c6037b43c60eb191e415b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 16300 bytes